вычислите 63/5-27/15+83/4-11/60

   63/5 - 27/15 + 83/4 - 11/60 == 189/15 - 27/15 + 1245/60 - 11/60 == 162/15 + 1234/60 = = 648/60 + 1234/60 == 1882/60 = 31 11/30